package com.springboot.tool;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {
	public static String md5(String plainText) {
		if(plainText!=null){
			byte[] secretBytes = null;
			try {
				secretBytes = MessageDigest.getInstance("md5").digest(
						plainText.getBytes());
			} catch (NoSuchAlgorithmException e) {
				throw new RuntimeException("没有md5这个算法！");
			}
			String md5code = new BigInteger(1, secretBytes).toString(16);
			for (int i = 0; i < 32 - md5code.length(); i++) {
				md5code = "0" + md5code;
			}
			return md5code;
		}else{
			return null;
		}
	}
}
